Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B43/00—Machines, pumps, or pumping installations having flexible working members
  • F04B43/12—Machines, pumps, or pumping installations having flexible working members having peristaltic action
  • F04B43/1253—Machines, pumps, or pumping installations having flexible working members having peristaltic action by using two or more rollers as squeezing elements, the rollers moving on an arc of a circle during squeezing
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
  • A61M39/22—Valves or arrangement of valves
  • A61M39/28—Clamping means for squeezing flexible tubes, e.g. roller clamps
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
  • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
  • A61M5/142—Pressure infusion, e.g. using pumps
  • A61M5/14212—Pumping with an aspiration and an expulsion action
  • A61M5/14232—Roller pumps
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M2205/00—General characteristics of the apparatus
  • A61M2205/12—General characteristics of the apparatus with interchangeable cassettes forming partially or totally the fluid circuit
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M2205/00—General characteristics of the apparatus
  • A61M2205/12—General characteristics of the apparatus with interchangeable cassettes forming partially or totally the fluid circuit
  • A61M2205/121—General characteristics of the apparatus with interchangeable cassettes forming partially or totally the fluid circuit interface between cassette and base
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M2205/00—General characteristics of the apparatus
  • A61M2205/14—Detection of the presence or absence of a tube, a connector or a container in an apparatus
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M2205/00—General characteristics of the apparatus
  • A61M2205/58—Means for facilitating use, e.g. by people with impaired vision
  • A61M2205/581—Means for facilitating use, e.g. by people with impaired vision by audible feedback
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M2205/00—General characteristics of the apparatus
  • A61M2205/58—Means for facilitating use, e.g. by people with impaired vision
  • A61M2205/582—Means for facilitating use, e.g. by people with impaired vision by tactile feedback
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
  • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
  • A61M39/22—Valves or arrangement of valves
  • A61M39/28—Clamping means for squeezing flexible tubes, e.g. roller clamps
  • A61M39/286—Wedge clamps, e.g. roller clamps with inclined guides
  • A61M39/287—Wedge formed by a slot having varying width, e.g. slide clamps
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49229—Prime mover or fluid pump making
  • Y10T29/49236—Fluid pump or compressor making

Definitions

• the present invention relates generally to a peristaltic pump and a removable cassette therefor.
• Peristaltic pumps are often used to deliver fluid in a very controlled manner such as, for example, the intravenous delivery of medicine to a patient.
• the peristaltic pump may generally include a pump body having a cassette removably attached thereto, and a tube supported by the cassette.
• a fluid e.g., medicine
• the cassette may further include an occlusion mechanism or occluder that interacts with the tube to occlude the tube to substantially prevent fluid inside the tube from flowing through the tube.
• a removable cassette for a peristaltic pump includes a cassette body and an occluder disposed at least partially in the cassette body and configured to be movable between an occluding position and a non-occluding position.
• the occluder includes an occluder body and an anti-ejection member integrally formed on the occluder body.
• the anti-ejection member is configured to substantially prevent the removal of the cassette from the peristaltic pump when the occluder is in the non-occluding position.
• FIG. 1 is a perspective view of an embodiment of a peristaltic pump assembly including a pump body and a removable cassette assembled therewith;
• Fig. 2 is a perspective, plan view of the pump body shown in Fig. 1 ;
• FIG. 3 is an enlarged, exploded perspective view of the removable cassette of Fig. 1 , including a cassette body, an occluder, and a cassette cover;
• Fig. 4 is a plan view of the cassette body of Fig. 3;
• FIGs. 5A and 5B are enlarged, cut-away, plan views of the assembly of a flexible tube with the cassette body and the occluder of the removable cassette, where Fig. 5A depicts the occluder in a non-occluding position, and Fig. 5B depicts the occluder in an occluding position;
• FIGs. 6A and 6B are perspective views of the removable cassette showing the position of an anti-ejection feature of the occluder when the occluder is in the occluding and the non-occluding positions, respectively; and [0011] Figs. 7A-7D are perspective views of the removable cassette depicting steps of a method of assembling the removable cassette.
• Embodiment(s) of the removable cassette for a peristaltic pump advantageously include an occluder movable between an occluding position and a non-occluding position, where the occluder includes an anti-ejection member that substantially prevents removal of the removable cassette from the peristaltic pump when the occluder is in the non-occluding position.
• the occluder is relatively simple in design and generally does not include overly delicate and/or intricate parts that may be jammed or easily broken during operation and/or routine maintenance of the cassette.
• the peristaltic pump including the cassette also may advantageously provide feedback to a user thereby indicating to the user that the occluder is in the occluding position so that the cassette may be ejected from the pump. Further, the peristaltic pump including the cassette is relatively easy to assemble and to use. [0013] As defined herein, the term "occlusion point" refers to an area or region on a tube at which the tube may be occluded by the occluder.
• occluding position refers to the position of the occluder in the cassette where the tube supported by the cassette is occluded at the occlusion point, thereby substantially preventing fluid from flowing through the tube at the occlusion point.
• non-occluding position refers to the position of the occluder in the cassette where the tube supported by the cassette is not occluded at the occlusion point, thereby allowing fluid to flow through the tube at the occlusion point.
• the term "ejection position” refers to the position of an anti-ejection member formed on the occluder where the anti-ejection member does not interface with a pump body retaining feature formed on the cassette body, thereby allowing the cassette to be removed from the pump body.
• the term "anti-ejection position” refers to the position of the anti-ejection member where the anti-ejection member interfaces with the pump body retaining feature, thereby preventing the cassette from being removed from the pump body.
• the pump body 14 includes a display 16 that corresponds with a keypad 18 for inputting user information such as, for example, patient identification number, drug identification number, operator identification number, or the like.
• the display 16 also provides visual feedback to the operator or user of the pump 10 regarding, for example, the amount of medication administered to the patient, the flow rate of the medication, and the time for medication administration.
• the pump body 14 also includes a cassette receiving portion 20 formed adjacent to the display 16.
• the cassette receiving portion 20 includes a partial cavity 22 defined by a floor (not shown) and two opposed walls 26, 28.
• the roller mechanism 29 is attached to a pump motor (not shown) through a bore (not shown) formed through the first opposed wall 26.
• each roller 30 is slip- fit onto a respective pin (the backs of which are shown at 102 in Fig. 1 ) supported by a yoke 100 (shown in Figs. 1 and 2).
• the yoke 100 is mounted to a drive shaft (not shown), which is operated by the pump motor. As the yoke rotates, the rollers 30 rotate as an assembly. It is to be understood that, since the rollers 30 are slip-fit onto the pins, the rollers 30 are also free to rotate individually in response to rotational forces imparted thereto from the rotational movement of the drive shaft. Details of an example of the pump body 14 including an example of the roller mechanism 29 may also be found in U.S. Application Serial Nos. 11/862,302 and 11/862,326 filed concurrently herewith (Docket Nos. DP-315954 and DP-315955, respectively), which are commonly owned by the Assignee of the present disclosure, and are incorporated herein by reference in their entirety.
• a flexible tube 34 which is also disposable, is disposed in the cassette 12.
• portions of the flexible tube 34 that are in contact with the rollers 30 compress or are otherwise occluded against a race 36 (shown in Fig. 3) of the cassette 12.
• a race 36 shown in Fig. 3
• fluid is temporarily retained in the tube 34 between the occluded points. In this manner, fluid is urged through the tube via peristaltic wave action.
• the tube 34 may be classified as substantially flexible so that the tube may be compressed and/or occluded by the rollers 30.
• the tube 34 is made of a polymeric material.
• suitable polymeric materials include silicones, AUTOPRENE (an opaque thermoplastic rubber with high wear resistance derived from SANTOPRENE, commercially available from Advanced Elastomer Systems, a subsidiary of ExxonMobil Chemical located in Houston, TX), VITON (a black fluoroelastomer with resistance to concentrated acids, solvents, ozone, radiation and temperatures up to 200 0 C with good chemical compatibility, commercially available from DuPont Performance Elastomers located in Wilmington, Delaware), TYGON (good chemical resistance with a clear finish, commercially available from Saint-Gobain Performance Plastics Corporation located in Akron, Ohio), PROTHANE Il (a transparent, blue, polyester, polyurethane tubing with good chemical resistance, commercially available from Randolph Austin Company located in Manchaca, Texas),
• a pump body retaining feature 35 (shown in Fig. 2) is located in the cassette receiving portion 20 of the pump body 14.
• the pump body retaining feature 35 is configured to matingly engage a cassette retaining feature 56 (shown in Figs. 1 and 4) formed on the cassette 12.
• the pump body retaining feature 35 may be a clip movable between a closed position and an opened position.
• the removable cassette 12 generally includes a cassette body 38, a removable occluder 40 at least partially disposed therein, and a cover 42 disposed over the cassette body 38. The cover 42 substantially secures the removable occluder 40 in the cassette body 38 when the occluder is assembled therewith.
• the cassette body 38 is a single, integrally formed piece of polymeric material and may be fabricated using, for example, injection molding, cast molding, and/or the like.
• the cassette body 38 includes a base 44 having a wall 46 substantially normal to the base 44 and surrounding at least a portion of the perimeter of the base 44.
• the cassette body 38 further includes two opposed ends 48, 50.
• An inlet 52 is formed at the first end 48 and is configured to receive a first end of the tube 34.
• An outlet 54 is formed in the cassette body 38 at the second end 50, where the outlet 54 is configured to receive a second end of the tube 34.
• An assembly of the tube 34 with the cassette body 38 is shown in Figs. 5A and 5B.
• the race 36 is integrally formed in the cassette body 38 and is positioned substantially normal to the base 44 and projects outwardly therefrom.
• the race 36 includes an occlusion surface 37 for the tube 34 to occlude the tube 34 when the rollers 30 force the tube 34 against the occlusion surface 37 during operation of the pump 10.
• a slide surface 64 is a substantially smooth surface for slidable movement of the occluder 40 when the occluder 40 is assembled with the cassette body 38. The assembly of the occluder 40 with the cassette body 38 will be described in more detail below in conjunction with Figs. 7A-7D.
• Cassette retaining feature 56 (shown in Figs. 3 and 4) is disposed adjacent to the inlet 52 formed in the cassette body 38. As mentioned above, the cassette retaining feature 56 is matingly engageable with the pump body retaining feature 35 included with the pump body 14 (shown in Fig. 2). Generally, the cassette retaining feature 56 is designed to complement or otherwise mate with the pump body retaining feature 35. In a non-limiting example, the cassette retaining feature 56 is a ledge formed in the cassette body 38 and is configured to receive and hold the pump body retaining feature 35 (e.g., a clip) when the pump body retaining feature 35 engages the cassette retaining feature 56.
• the pump body retaining feature 35 e.g., a clip
• the pump body retaining feature 35 captures the cassette retaining feature 56 and releasably attaches the cassette 12 to the pump body 14. It is within the purview of the present disclosure that other configurations or designs for the pump body retaining feature 35 and the cassette retaining feature 56 may also be used to removably attach the cassette 12 to the pump body 14, as desired.
• the cassette body 38 also includes an anti-ejection member- receiving slot 68 formed therein.
• the anti-ejection member- receiving slot 68 may generally resemble a key hole slot, where the slot 68 includes a narrow portion 70 and a wider portion 74.
• the key hole configuration of the slot 68 facilitates assembly of the occluder 40 with the cassette body 38. This assembly will be described in more detail below.
• anti-ejection member-receiving slot 68 is configured to receive an anti-ejection member 72 (shown in Fig. 2) formed on the occluder 40, and further operates as a guide for the anti-ejection member 72.
• the slot 68 is configured to allow the anti-ejection member 72 to move into a position to substantially prevent removal of the cassette 12 when the occluder 40 is in the non-occluding position; or to move into a position to allow removal of the cassette 12 when the occluder 40 is in the occluding position. Movement of the anti-ejection member 72 will be described further in conjunction with Figs. 6A and 6B.
• the occluder 40 generally includes an occluder body 76 and the anti-ejection member 72 integrally formed thereon, and is configured to be movable between the occluding position and the non-occluding position.
• the occluder body 76 is convex in shape and substantially conforms to the shape of the slide surface 64 formed adjacent to the race 36. It is to be understood that other shapes (e.g., a flat shape) may also be used for the occluder body 76 as long as the cassette body 38 is formed to accommodate the shape of the occluder body 76.
• the occluder 40 includes first and second opposed sides 78, 80, where the first side 78 is configured to slidably contact the slide member 64, and the second side 80 includes a toggle member 82 extending outwardly therefrom and located proximate to a first end 83 of the occluder 40.
• the toggle member 82 is embossed or otherwise defined in the occluder body 76 such that the toggle member 82 protrudes from the second side 80.
• the toggle member 82 extends outwardly from the occluder body 76 and through an opening 84 defined in the cassette body 38.
• the toggle member 82 actuates movement of the occluder 40 between the non-occluding position and the occluding position, shown in Figs. 5A and 5B, respectively. Further, when the user moves the toggle member 82 to allow the occluder 40 to move into the occluding position, the cassette 12 provides feedback to the user that the occluder 40 is in the occluding position. Non-limiting examples of feedback include tactile feedback, audible feedback, and/or the like, and/or combinations thereof.
• a releasable locking feature e.g., a detent
• a releasable locking feature may be provided between the occluder 40 and the cassette body 38 that may audibly "click” and/or provide a feel to a user that the occluder 40 has been placed into the occluded position.
• the occluder 40 also includes an occlusion slot 86 formed in the occluder body 76 proximate to a second end 88 of the occluder 40.
• the occlusion slot 86 is configured to substantially occlude the tube 34 when the occluder 40 is in the occluding position, and is further configured to substantially allow free flow of fluid through the tube 34 when the occluder is in the non-occluding position.
• the occlusion slot 86 is a key hole slot having a narrow portion 90 and a wider portion 92. In this embodiment, and as shown in Figs.
• the occlusion slot 86 receives the tube 34 in the wider portion 92 thereof when the occluder 40 is in the non-occluding position, and receives the tube 34 in the narrow portion 90 when the occluder 40 is in the occluding position.
• the occluder 40 further includes the anti-ejection member 72 formed on an edge 94 of the occluder body 76 located proximate to the second end 88.
• the anti-ejection member 72 is generally a tab projecting from the edge 94 and extending substantially perpendicular thereto.
• the anti-ejection member 72 is configured to substantially prevent removal of the cassette 12 from the peristaltic pump 10 when the occluder 40 is in the non- occluding position, and is further configured to allow removal of the cassette 12 from the peristaltic pump 10 when the occluder 40 is in the occluding position. This may be accomplished by causing the anti-ejection member 72 to either lock or unlock the cassette retaining feature 56. In a non-limiting example, as shown in Fig. 6A, when the occluder 40 is in the occluding position, the anti-ejection member 72 moves into an ejection position.
• the anti-ejection member 72 does not interface with the pump body retaining feature 35, thereby allowing the cassette 12 to be removed from the pump 10.
• the anti-ejection member 72 is in an anti-ejection position. In this position, the anti-ejection member 72 interfaces with the pump body retaining feature 35, thereby substantially locking the cassette 12 to the pump body 14. This prevents the cassette 12 from being removed or ejected from the pump 10.
• a method of assembling the cassette 12 is shown in Figs. 7A-7D.
• the method generally includes providing the cassette body 38 and providing the occluder 40 as described above, and at least partially disposing the occluder 40 in the cassette body 38.
• An embodiment of a method of disposing the occluder 40 in the cassette body 38 may be accomplished as set forth below. [0031] Referring now to Fig. 7A, the occluder 40, including the tube 34
• a plane X parallel to the cassette body 38 e.g., plane X includes points defined by ends 48 and 50 (shown in Fig. 7B) of the cassette body 38.
• the second end 88 of the occluder 40 including the anti-ejection member 72 is positioned substantially perpendicularly to the anti-ejection member-receiving slot 68 at a first side 96 of the base 44 of the cassette body 38.
• the end 88 including the anti-ejection member 72 is substantially complementarily shaped with the anti-ejection member-receiving slot 68 so that the occluder 40 can easily slide therein.
• the positioning of the second end 88 is such that the anti-ejection member 72 is substantially aligned with the wide portion 92 of the slot 68.
• the occluder 40 is passed through the anti-ejection member-receiving slot 68 until the anti-ejection member 72 is exposed on a second, opposed side 98 of the base 44.
• the occluder 40 is rotated counterclockwise about 90° relative to the base 44 so that a side edge 94 (shown in Fig. 3) of the occluder body 76 is substantially aligned with the plane X.
• the toggle member 82 is received through the opening 84 for access thereto by a user of the cassette 12.
• the tube 34 already disposed through the slot 86 (best seen in Fig. 3) formed in the occluder 40, is fed through the inlet 52 formed in the cassette body 38 and through the outlet 54.
• the cover 42 is then disposed over the cassette body 38 and secured thereto via latching, snapping, welding, and/or the like, and/or combinations thereof. When the cover 42 is secured to the cassette body 38, the occluder 40 is substantially secured therein.
• Couple/coupled or the like is broadly defined herein to encompass a variety of divergent coupling arrangements and assembly techniques. These arrangements and techniques include, but are not limited to (1) the direct coupling between one component and another component with no intervening components therebetween; and (2) the coupling of one component and another component with one or more components therebetween, provided that the one component being “coupled to” the other component is somehow operatively coupled to the other component (notwithstanding the presence of one or more additional components therebetween).

Landscapes

• Health & Medical Sciences (AREA)
• Engineering & Computer Science (AREA)
• Heart & Thoracic Surgery (AREA)
• Hematology (AREA)
• Animal Behavior & Ethology (AREA)
• Veterinary Medicine (AREA)
• Anesthesiology (AREA)
• Biomedical Technology (AREA)
• Public Health (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Health & Medical Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Pulmonology (AREA)
• Vascular Medicine (AREA)
• Reciprocating Pumps (AREA)
• Infusion, Injection, And Reservoir Apparatuses (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (6)

Cited By (15)

Families Citing this family (55)

Citations (7)

Family Cites Families (364)

• 2007
  • 2007-09-27 US US11/862,360 patent/US8062008B2/en active Active
• 2008
  • 2008-09-25 EP EP08833018.8A patent/EP2195538A4/de not_active Withdrawn
  • 2008-09-25 AU AU2008305585A patent/AU2008305585B2/en not_active Ceased
  • 2008-09-25 CA CA2697577A patent/CA2697577C/en not_active Expired - Fee Related
  • 2008-09-25 WO PCT/US2008/011130 patent/WO2009042181A1/en not_active Ceased
  • 2008-09-25 KR KR1020107009241A patent/KR101462495B1/ko active Active

Patent Citations (7)

Non-Patent Citations (1)

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